// JavaScript Document
jQuery
        .extend({

            createUploadIframe : function(id, uri) {

                // create frame
                var frameId = 'jUploadFrame' + id;

                if (window.ActiveXObject) {
                    var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                    if (typeof uri == 'boolean') {
                        io.src = 'javascript:false';
                    }
                    else if (typeof uri == 'string') {
                        io.src = uri;
                    }
                }
                else {
                    var io = document.createElement('iframe');
                    io.id = frameId;
                    io.name = frameId;
                }
                io.style.position = 'absolute';
                io.style.top = '-1000px';
                io.style.left = '-1000px';

                document.body.appendChild(io);

                return io;
            },
            createUploadForm : function(id, fileElementId) {

                // create form
                var formId = 'jUploadForm' + id;
                var fileId = 'jUploadFile' + id;
                var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId
                        + '" enctype="multipart/form-data"></form>');
                var oldElement = jQuery('#' + fileElementId);
                var newElement = jQuery(oldElement).clone();
                jQuery(oldElement).attr('id', fileId);
                jQuery(oldElement).before(newElement);
                jQuery(oldElement).appendTo(form);
                // set attributes
                jQuery(form).css('position', 'absolute');
                jQuery(form).css('top', '-1200px');
                jQuery(form).css('left', '-1200px');
                jQuery(form).appendTo('body');
                return form;
            },

            ajaxFileUpload : function(s) {

                // TODO introduce global settings, allowing the client to modify
                // them
                // for all requests, not only timeout
                s = jQuery.extend({}, jQuery.ajaxSettings, s);
                var id = s.fileElementId;
                var form = jQuery.createUploadForm(id, s.fileElementId);
                var io = jQuery.createUploadIframe(id, s.secureuri);
                var frameId = 'jUploadFrame' + id;
                var formId = 'jUploadForm' + id;

                if (s.global && !jQuery.active++) {
                    // Watch for a new set of requests
                    jQuery.event.trigger("ajaxStart");
                }
                var requestDone = false;
                // Create the request object
                var xml = {};
                if (s.global) {
                    jQuery.event.trigger("ajaxSend", [ xml, s ]);
                }

                var uploadCallback = function(isTimeout) {

                    // Wait for a response to come back
                    var io = document.getElementById(frameId);
                    try {
                        if (io.contentWindow) {
                            xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML
                                    : null;
                            xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
                                    : io.contentWindow.document;

                        }
                        else if (io.contentDocument) {
                            xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML
                                    : null;
                            xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
                                    : io.contentDocument.document;
                        }
                    }
                    catch (e) {
                        jQuery.handleError(s, xml, null, e);
                    }
                    if (xml || isTimeout == "timeout") {
                        requestDone = true;
                        var status;
                        try {
                            status = isTimeout != "timeout" ? "success" : "error";
                            // Make sure that the request was successful or
                            // notmodified
                            if (status != "error") {
                                // process the data (runs the xml through
                                // httpData
                                // regardless of callback)
                                var data = jQuery.uploadHttpData(xml, s.dataType);
                                if (s.success) {
                                    // ifa local callback was specified, fire it
                                    // and pass it the data
                                    s.success(data, status);
                                }
                                ;
                                if (s.global) {
                                    // Fire the global callback
                                    jQuery.event.trigger("ajaxSuccess", [ xml, s ]);
                                }
                                ;
                            }
                            else {
                                jQuery.handleError(s, xml, status);
                            }

                        }
                        catch (e) {
                            status = "error";
                            jQuery.handleError(s, xml, status, e);
                        }
                        ;
                        if (s.global) {
                            // The request was completed
                            jQuery.event.trigger("ajaxComplete", [ xml, s ]);
                        }
                        ;

                        // Handle the global AJAX counter
                        if (s.global && !--jQuery.active) {
                            jQuery.event.trigger("ajaxStop");
                        }
                        ;
                        if (s.complete) {
                            s.complete(xml, status);
                        }
                        ;

                        jQuery(io).unbind();

                        setTimeout(function() {

                            try {
                                jQuery(io).remove();
                                jQuery(form).remove();

                            }
                            catch (e) {
                                jQuery.handleError(s, xml, null, e);
                            }

                        }, 100);

                        xml = null;

                    }
                    ;
                }
                // Timeout checker
                if (s.timeout > 0) {
                    setTimeout(function() {

                        if (!requestDone) {
                            // Check to see ifthe request is still happening
                            uploadCallback("timeout");
                        }

                    }, s.timeout);
                }
                try {
                    var form = jQuery('#' + formId);
                    jQuery(form).attr('action', s.url);
                    jQuery(form).attr('method', 'POST');
                    jQuery(form).attr('target', frameId);
                    if (form.encoding) {
                        form.encoding = 'multipart/form-data';
                    }
                    else {
                        form.enctype = 'multipart/form-data';
                    }
                    jQuery(form).submit();

                }
                catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (window.attachEvent) {
                    document.getElementById(frameId).attachEvent('onload', uploadCallback);
                }
                else {
                    document.getElementById(frameId).addEventListener('load', uploadCallback, false);
                }
                return {
                    abort : function() {

                    }
                };

            },

            uploadHttpData : function(r, type) {

                var data = !type;
                data = type == "xml" || data ? r.responseXML : r.responseText;
                // ifthe type is "script", eval it in global context
                if (type == "script") {
                    jQuery.globalEval(data);
                }

                // Get the JavaScript object, ifJSON is used.
                if (type == "json") {
                    // 本人新增代码,优化图片上传
                    if (data.indexOf('<pre') != -1) {
                    	if(data.indexOf('style')!=-1){
                    		var index=data.indexOf('{');
                            data = data.substring(index, data.length - 6);
                    	}else{
                    		data = data.substring(5, data.length - 6);
                    	}
                    }
                    eval("data = " +data);
                }

                // evaluate scripts within html
                if (type == "html") {
                    jQuery("<div>").html(data).evalScripts();
                }

                return data;
            },

            handleError : function(s, xhr, status, e) {

                // If a local callback was specified, fire it
                if (s.error) {
                    s.error.call(s.context || s, xhr, status, e);
                }

                // Fire the global callback
                if (s.global) {
                    (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [ xhr, s, e ]);
                }
            }
        });
